KR20180099585A - Non-contact power transmission syatem with overheat protection and method thereof - Google Patents

Abstract

An objective of the present invention is to prevent damage to a battery cell module due to overheating when a battery cell module is charged. The present invention relates to a system for non-contact power transmission with an overheating protection function and a method thereof, capable of fully charging a battery cell module while preventing overheating of the battery cell module. To this end, a non-contact power transmission device transmits first power to a non-contact power receiving device through a power transmission coil to charge the battery cell module. When an overheating alarm signal is received from the non-contact power receiving device, the non-contact power transmission device transmits second power lower than the first power to the non-contact power receiving device through the power transmission coil to charge the battery cell module.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-contact power transmission system and a method for overheating protection,

The present invention relates to a contactless power transmission system and method having an overheat protection function for preventing a battery cell module from being damaged by overheating when a battery cell module is charged with electric power.

2. Description of the Related Art A portable terminal such as a mobile phone and a PDA (Personal Digital Assistant) generally has a battery pack. The battery pack charges electric power supplied from an external charging device and supplies the charged electric power to the portable terminal so that the portable terminal can be operated according to a user's operation.

The battery pack includes a battery cell module for charging electric power and a charge and discharge circuit for charging and discharging electric power to the battery cell module.

In a method of electrically connecting a battery pack provided in the portable terminal to a charging device supplying electric energy, there is a terminal connection method in which a terminal of the charging device is directly connected to a terminal of the battery pack.

However, when the terminals of the charging device and the terminals of the battery pack are brought into contact with each other or separated from each other, the terminal connection method causes an instantaneous discharge phenomenon because the terminals of the battery pack and the terminals of the charging device have different potential differences .

Such an instantaneous discharge phenomenon may worsen the terminals of the battery pack and the terminals of the charging device and cause a safety accident such as a fire when foreign substances are accumulated on the terminals of the battery pack and the terminals of the charging device.

In addition, there is a problem that electric energy charged in the battery pack due to moisture or the like is naturally discharged to the outside through the terminal of the battery pack, thereby shortening the service life of the battery pack and deteriorating the performance.

Recently, in order to solve various problems of the terminal connection method as described above, a non-contact power transmission system using a power transmission method at a non-contact point has been proposed.

In such a non-contact power transmission system, a lot of efforts have been made to increase the transmission efficiency of power with stable power transmission and power reception.

Korean Patent Laid-Open No. 10-2007-0028896 ("Solid-state Charging Device ", LG Electronics Co., Ltd., Mar. 13, 2007)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a contactless power transmission system having an overheat protection function for protecting a battery cell module from being damaged by overheating when the battery cell module is charged with electric power, Method.

It is another object of the present invention to provide a non-contact power transmission device in which a first power is transmitted to a contactless power receiving device to charge the battery cell module, and when the battery cell module is overheated to a set temperature or higher, A contactless power transmission system having an overheat protection function for protecting the battery cell module from being damaged by overheating by allowing the device to transmit a second power lower than the first power to the contactless power receiving device to charge the battery cell module; Method.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. There will be.

According to an aspect of the present invention, in a state in which the contactless power receiving device receives the first power transmitted by the contactless power transmission device and the charging device charges the battery cell module, It is determined whether or not overheating has occurred in the battery.

The determination of the overheating may be made by detecting a first temperature of the battery cell module by the first temperature sensor and determining that the battery cell module is overheated when the detected first temperature is equal to or higher than the set temperature.

The first temperature sensor detects a first temperature of the battery cell module, the second temperature sensor detects an external second temperature, and the first temperature is higher than the second temperature. It can be determined that the battery cell module is overheated when the temperature is higher than the predetermined temperature.

When it is determined that the battery cell module is overheated, the non-contact power receiving device generates an overheating alarm signal and transmits the signal to the contactless power transmission device.

Wherein the non-contact power transmission device transmits a second power lower than the first power to the contactless power receiving device when the overheat alarm signal is received from the contactless power receiving device, thereby charging the battery cell module with the second power To prevent overheating.

Further, the non-contact power receiving apparatus prevents the occurrence of an error by switching to a second power charging mode in which the charging device charges the battery cell module with the second power after generating the overheating alarm signal.

Therefore, an embodiment of the non-contact power transmission apparatus having the overheat protection function of the present invention includes a power transmission unit including a power transmission coil for transmitting power to the non-contact power reception apparatus, And a controller for controlling the power transmitting unit to transmit the first power to the contactless power receiving apparatus when the first signal receiving unit receives the overheating alarm signal, And a non-contact power transmission control unit for controlling the means to transmit the second power lower than the first power.

The power transmission unit includes a drive driver for generating a drive signal for transmitting the first power or the second power under the control of the contactless power transmission control unit, and a series resonance type converter And a power transmission coil for transmitting the first power or the second power to the contactless power receiving device while being resonated with the power switched by the series resonant converter.

According to another aspect of the present invention, there is provided a contactless power transmission apparatus having an overheat protection function, comprising: a first signal transmission unit for generating an ID request signal according to a control of the contactless power transmission control unit and transmitting the ID request signal to the contactless power reception device; The first signal receiving unit receives the ID signal transmitted by the non-contact power receiving device according to the ID request signal, and provides the ID signal to the non-contact power transmission control unit.

Another embodiment of the contactless power transmission device having the overheat protection function of the present invention includes a charging device that receives the first power transmitted by the contactless power transmission device and charges the battery cell module, A second signal transmitter for transmitting the overheat alarm signal to the contactless power transmission device; and a second signal transmitter for determining whether the battery cell module is overheated, And a non-contact power receiving control unit for controlling the charging apparatus to charge the battery cell module by receiving a second power lower than the first power from the contactless power transmission apparatus.

Further, another embodiment of the contactless power receiving apparatus having the overheat protection function of the present invention may further include a first temperature sensor for detecting a first temperature of the battery cell module, Temperature of the battery cell module.

According to another aspect of the present invention, there is provided a contactless power receiving apparatus having an overheat protection function, the contactless power receiving apparatus further comprising a second temperature sensor for detecting an external second temperature, And determines that the battery cell module is overheated when the difference of the first temperature is greater than a predetermined value.

Another embodiment of the contactless power receiving apparatus having the overheat protection function of the present invention includes a second signal receiving unit for receiving the ID request signal transmitted by the contactless power transmission apparatus and providing the ID request signal to the contactless power receiving control unit And when the ID request signal is received, the second signal transmission unit generates an ID signal according to the control of the contactless power receiving control unit and transmits the ID signal to the contactless power transmission device.

Wherein the charging device comprises: a power receiving coil for receiving the first power or the second power transmitted by the contactless power transmission device; and a controller for controlling the first power or the second power received by the power receiving coil to be DC power And a charging unit charging the battery cell module with DC power rectified by the rectifying unit under the control of the contactless power receiving control unit.

A method for receiving a non-contact power with an overheat protection function according to the present invention includes the steps of: a non-contact power transmission device transmitting a first power to a non-contact power receiving device through a power transmission coil; And when the signal is received, the non-contact power transmission device transmits a second power lower than the first power to the non-contact power receiving device through the power transmission coil.

The step of transmitting the first power may include transmitting the ID request signal to the non-contact power receiving device by the contactless power transmission device, receiving an ID signal from the contactless power receiving device in response to the ID request signal And transmitting the first power in the case of the first power.

Wherein the step of transmitting the ID request signal comprises the steps of: determining whether a load variation occurs in the power transmission coil; and transmitting the ID request signal when it is determined that a load variation has occurred in the power transmission coil .

Also, the non-contact power transmission method having the overheat protection function of the present invention includes stopping the non-contact power transmission control unit from transmitting power when a charge completion signal is received from the non-contact power receiving apparatus.

Another embodiment of the contactless power transmission method having the overheat protection function of the present invention includes the steps of charging the battery cell module with the first power transmitted by the contactless power transmission device by the charging device and charging the battery cell module with the non- The method comprising the steps of: determining whether the battery cell module is overheated; determining whether the battery cell module is overheated, when the contactless power receiving control unit transmits an overheating alarm signal to the contactless power transmission device, Receiving the second power lower than the first power and charging the battery cell module.

Wherein the step of determining whether the battery cell module is overheated includes the steps of: detecting a first temperature of the battery cell module by a first temperature sensor; determining whether the battery cell module is overheated when the first temperature is equal to or higher than a predetermined temperature; .

Wherein the step of determining whether the battery cell module is overheated includes the steps of: detecting a first temperature of the battery cell module by a first temperature sensor; detecting a second external temperature of the second temperature sensor; And determining that the battery cell module is overheated when the difference between the temperature and the first temperature is greater than a predetermined value.

Further, another embodiment of the contactless power receiving method having the overheat protection function of the present invention includes the steps of: determining whether the contactless power receiving control unit has completed charging of the battery cell module; Generating a charge completion signal and transmitting the charge completion signal to the contactless power transmission device.

According to the non-contact power transmission system and method of the present invention, when the non-contact power transmission device transmits the first power to the non-contact power receiving device to charge the battery cell module, And when the overheating is judged, the contactless power transmission device transmits the second power lower than the first power to the contactless power receiving device to charge the battery cell module with the second power .

Therefore, when the battery cell module is charged with electric power, the battery cell module can be prevented from being overheated and damaged in advance, and the battery cell module can be fully charged in a state in which the battery cell module is not damaged by overheating.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout.
1 is a diagram illustrating a configuration of a preferred embodiment of a contactless power transmission system according to the present invention;
2 is a signal flow diagram illustrating the operation of an embodiment of a contactless power transmission control according to the method of the present invention, and
3 is a signal flow diagram illustrating the operation of the embodiment of the contactless power reception controller according to the method of the present invention.

The following detailed description is merely an example, and is merely an example of the present invention. Further, the principles and concepts of the present invention are provided for the purpose of being most useful and readily explaining.

Accordingly, it is not intended to provide a more detailed structure than is necessary for a basic understanding of the present invention, but it should be understood by those skilled in the art that various forms that can be practiced in the present invention are illustrated in the drawings.

1 is a diagram showing a configuration of a preferred embodiment of a contactless power transmission system having an overheat protection function according to the present invention. As shown in the figure, the contactless power transmission system having the overheat protection function of the present invention may include the contactless power transmission device 100 and the contactless power receiving device 200. [

The contactless power transmission device 100 and the contactless power receiving device 200 transmit electric power using an electromagnetic induction method. The contactless power transmission device 100 is a contactless power transmission device, 1 power, and the non-contact power receiving apparatus 200 receives the first power or the second power transmitted by the non-contact power transmission apparatus 100 at a non-contact point, Module 250 or supplies power to a load such as a portable terminal equipped with the contactless power receiving apparatus 200. [

The contactless power transmission apparatus 100 operates by DC power supplied from an AC / DC converter (not shown), and the AC / DC converter is separately provided from the contactless power transmission apparatus 100 Or may be provided integrally with the contactless power transmission device 100.

The contactless power transmission apparatus 100 includes a contactless power transmission control unit 110, a power transmission unit, a first signal transmission unit 150, and a first signal reception unit 160.

The contactless power transmission control unit 110 recognizes the contactless power receiving apparatus 200 and controls an operation of transmitting the first power to a contactless state or transmitting a second power lower than the first power .

The power transmission unit transmits the first power or the second power to the non-contact power receiving apparatus 200 at a non-contact point under the control of the contactless power transmission control unit 110, and includes a driving driver 120, A resonant converter 130 and a power transmission coil 140.

According to the control of the contactless power transmission control unit 110, the drive driver 120 drives a drive signal for detecting a variation in load, a drive signal for transmitting the first power to the contactless point, Signal or the like.

The series resonant converter 130 switches the DC power supplied from the AC / DC converter or the like in accordance with a driving signal generated by the driving driver 120.

The power transmission coil 140 of the power transmission unit generates a signal for detecting a variation of the load while being serially resonated with the power switched by the series resonant converter 130, Lt; / RTI >

Here, although only one power transmission coil 140 is shown, in the practice of the present invention, two or more power transmission coils may be connected in parallel. And a plurality of power transmission coils connected in series to the plurality of power transmission coils, wherein each of the plurality of power transmission coils includes switches and capacitors connected in series to each of the plurality of power transmission coils, So that switched power in the resonant converter 130 can be selectively output to the plurality of power transmission coils.

The first signal transmission unit 150 generates an ID (Identification) request signal according to the control of the contactless power transmission control unit 110 and outputs an ID request signal or the like to the power transmission coil 140 To be transmitted to the non-contact power receiving apparatus 200.

The first signal receiving unit 160 receives a signal varying the load of the power transmission coil 140, an ID signal transmitted by the non-contact power receiving apparatus 200, an overheat alarm signal, a charge completion signal, An ID signal, an overheat alarm signal, and a charge completion signal to the contactless power transmission control unit 110. [0042]

The non-contact power receiving apparatus 200 includes a contactless power receiving control unit 210, a charging apparatus, a battery cell module 250, a second signal receiving unit 260, a first temperature sensor 270, 280 and a second signal transmission unit 290, and the like.

The non-contact power receiving control unit 210 controls transmission of an ID signal to the non-contact power transmission apparatus 100 according to an ID request signal transmitted from the contactless power transmission apparatus 100, And controls charging of the battery cell module 250 by receiving the first power or the second power transmitted from the transmission apparatus 100. When the battery cell module 250 is overheated, the overheating alarm signal is generated To the non-contact power transmission apparatus (100).

The charging device receives the first power or the second power transmitted from the contactless power transmission device 100 and charges the battery cell module 250 under the control of the contactless power receiving control part 210 A power receiving coil 220, a rectifying part 230, and a charging part 240. [

The power receiving coil 220 is coupled to the power transmission coil 140 of the non-contact power transmission device 100 in an electromagnetic induction manner to generate a first power or a second power Lt; / RTI >

The rectifier 230 rectifies the first power or the second power received by the power receiving coil 220 and converts the first power or the second power into DC power.

The charging unit 240 charges the battery cell module 250 under the control of the non-contact power receiving control unit 210. The rectifying unit 230 rectifies the rectified DC power.

The second signal receiving unit 260 receives an ID request signal or the like transmitted by the contactless power transmission apparatus 100 through the power receiving coil 220 and outputs the received ID request signal or the like to the non- And provides it to the control unit 210.

The first temperature sensor 270 detects a first temperature of the battery cell module 250 and provides the detected first temperature to the contactless power receiving control unit 210.

The second temperature sensor 280 detects an external second temperature and provides the detected second temperature to the contactless power receiving control unit 210.

The second signal transmitter 290 generates an ID signal, an overheat alarm signal, a charge completion signal and the like in accordance with the control of the contactless power receiving control unit 210 and generates an ID signal, an overheat alarm signal, To the non-contact power transmission device (100) through the power receiving coil (220).

2 is a signal flow diagram illustrating the operation of the embodiment of the non-contact power transmission control unit 110 of the non-contact power transmission device 100 according to the method of the present invention. 2, in order for the non-contact power transmission apparatus 100 to transmit power to the non-contact power receiving apparatus 200, first, the power transmitted from the non-contact power transmission apparatus 100 is transmitted to the non-contact power receiving apparatus 200 It is necessary to judge whether or not it is possible to receive it. That is, it is necessary to determine whether or not the power receiving coil 220 of the non-contact power receiving apparatus 200 is located at the position of the power transmitting coil 140 provided in the non-contact power transmission apparatus 100.

To this end, the non-contact power transmission control unit 110 of the non-contact power transmission apparatus 100 controls the drive driver 120 to generate a drive signal for detecting a change in load (S100).

The driving signal generated by the driving driver 120 is input to the series resonant converter 130.

The series resonant converter 130 includes a plurality of switching elements such as a plurality of transistors or a plurality of MOSFETs. In response to a driving signal generated by the driving driver 120, a plurality of switching elements are selectively switched, Generates AC power, and outputs the generated AC power to the power transmission coil 140 so that the series resonance is generated in the power transmission coil 140.

In this state, the first signal receiving unit 160 receives the signal of the power transmission coil 140 and outputs the received signal to the non-contact power transmission control unit 110.

The contactless power transmission control unit 110 receives a signal of the first signal receiving unit 160 and determines whether a change in the load occurs in the power transmission coil 140 using the input signal S102).

That is, when the power receiving coil 220 of the non-contact power receiving apparatus 200 is not brought close to the power transmitting coil 140, the impedance of the power transmitting coil 220 is not changed.

The first signal receiving unit 160 receives only a frequency signal corresponding to a driving signal generated by the driving driver 120 and the contactless power transmission control unit 110 controls the first signal receiving unit 160 It can be determined that the load is not fluctuated in the power transmission coil 140 by the signal.

When the power receiving coil 220 of the contactless power receiving apparatus 200 is brought close to the power transmitting coil 140 to charge the battery pack module 240 of the contactless power receiving apparatus 200, An impedance change occurs in the power transmission coil 140 and a frequency of a signal applied to the power transmission coil 140 in accordance with a change in the generated impedance is changed.

The first signal receiving unit 160 receives a signal of a frequency varying according to the impedance change. The non-contact power transmission control unit 110 receives the signal of the first signal receiving unit 160, It is determined that the load fluctuation occurs in the load 140.

If it is determined in step S102 that no load fluctuation has occurred, the contactless power transmission control unit 110 returns to step S100 and the drive driver 120 continuously detects a load variation So as to repeatedly perform the operation of determining whether or not the load fluctuation has occurred.

If it is determined in step S102 that the load has changed, the contactless power transmission control unit 110 controls the first signal transmission unit 150 to transmit the ID requesting the ID of the contactless power receiving apparatus 200 And transmits the generated ID request signal to the non-contact power receiving apparatus 200 through the power transmitting coil 140 (S104).

The contactless power transmission control unit 110 receives a signal from the first signal receiving unit 160 and determines whether an ID signal is received from the contactless power receiving apparatus 200 at step S106.

That is, there are various causes of the impedance change in the power transmission coil 140. For example, as described above, the impedance change may occur when the power receiving coil 220 of the non-contact power receiving apparatus 200 is brought close to the power transmitting coil 140. However, An impedance change may occur even when another foreign substance other than the power transmission coil 140 is brought close to the power transmission coil 140. [

When the contactless power transmission apparatus 100 transmits power when an impedance is generated by the foreign matter, much power is consumed unnecessarily.

Therefore, when the load variation of the power transmission coil 140 is determined, the contactless power transmission control unit 110 transmits an ID request signal for requesting an ID to the contactless power receiving apparatus 200, When the ID signal is received from the non-contact power receiving apparatus 200, the non-contact power transmission control unit 110 controls the contactless power receiving apparatus 200 such that the impedance of the power transmission coil 140 changes .

If it is determined in step S106 that the ID signal is not received, the contactless power transmission control unit 110 determines whether a predetermined time has elapsed (step S108). If the predetermined time has not elapsed The operation returns to step S106 to repeat the operation of determining whether or not the ID is received from the contactless power receiving apparatus 200. [

If the ID signal is not received from the non-contact power receiving apparatus 200 even after the predetermined time elapses, the non-contact power transmission control unit 110 returns to step S100 to detect a load variation The operation is repeated from the operation of generating the driving signal.

When the ID signal is received before the predetermined time elapses, the contactless power transmission control unit 110 transmits the ID signal to the power receiving coil 220 of the contactless power receiving apparatus 200, And controls the driving driver 120 to generate a driving signal for transmitting the first power (S110).

The switching elements of the series resonant converter 130 are switched according to a driving signal for transmitting the first power generated by the driving driver 120 so that the DC power is switched and the switched power is supplied to the power transmission coil 140. [ And the first power is transmitted from the power transmission coil 140 to the power receiving coil 220 of the non-contact power receiving apparatus 200.

In this state, the contactless power transmission control unit 110 receives the signal of the first signal receiving unit 160 and determines whether or not an overheat alarm signal is received from the contactless power receiving apparatus 200 (S112 If the overheating alarm signal is not received, the non-contact power transmission control unit 110 determines whether a charge completion signal is received from the non-contact power receiving apparatus 200 (S114).

When the charging completion signal is received from the non-contact power receiving apparatus 200, the non-contact power transmission control unit 110 ends the power transmission operation.

When the overheat alarm signal is received before the charge completion signal is received from the contactless power receiving apparatus 200, the contactless power transmission control unit 110 controls the drive driver 120 to output a signal 2 power is generated (S116).

The switching elements of the series resonant converter 130 are switched according to a driving signal for transmitting the second power generated by the driving driver 120, The second power is transmitted to the second power supply 220.

In this state, the contactless power transmission control unit 110 receives a signal from the first signal receiving unit 160 and determines whether a charge completion signal is received from the contactless power receiving apparatus 200 (S118) .

If the charging completion signal is not received, the contactless power transmission control unit 110 returns to step S116 to cause the driving driver 120 to continuously generate the driving signal for transmitting the second power , And repeats the operation of determining whether the charging completion signal is received from the contactless power receiving apparatus 200. When the charging completion signal is received, the power transmission operation is terminated.

3 is a signal flow diagram illustrating an operation of the embodiment of the non-contact power receiving control unit 210 according to the method of the present invention. Referring to FIG. 3, the non-contact power receiving control unit 210 determines whether an ID request signal is received from the non-contact power transmission device 100 (S200).

That is, when the non-contact power transmission control unit 110 of the non-contact power transmission apparatus 100 controls the first signal transmission unit 150 in step S104 to transmit the ID request signal to the power transmission coil 140 And the second signal receiving unit 260 receives the induced ID request signal and inputs the received ID request signal to the non-contact power receiving control unit 210. The non-contact power receiving control unit 210 receives the ID request signal, Receives a signal received by the second signal receiving unit 260, and determines whether or not an ID request signal is received.

When the ID request signal is received from the non-contact power transmission apparatus 100, the non-contact power reception control unit 210 controls the second signal transmission unit 290 to generate an ID signal, To the non-contact power transmission apparatus 100 through the power receiving coil 220 (S202).

The ID signal transmitted by the contactless power receiving apparatus 200 is guided from the power receiving coil 220 to the power transmitting coil 140 and the ID signal guided to the power transmitting coil 140 1 power supply control unit 110 receives the signal from the first signal receiving unit 160 and inputs the signal to the non-contact power transmission control unit 110. In step S106, It can be determined whether or not a signal is received.

In this state, the first power transmitted to the contactless power transmission apparatus 100 by the contactless power transmission apparatus 100 is guided to the power receiving coil 220, the rectified current is rectified by the rectifying unit 230, And the non-contact power receiving control unit 210 monitors the charging unit 240 to determine whether the first power is received (S204).

When the first power is received from the contactless power transmission apparatus 100, the contactless power receiving control unit 210 controls the charging unit 240 to transmit the received first power to the battery cell module 250, (S206).

In a state where the first power is charged to the battery cell module 250, the non-contact power receiving control unit 210 determines whether the battery cell module 250 is overheated (S208).

The overheat of the battery cell module 250 can be determined in various ways.

For example, the non-contact power receiving and controlling part 210 detects the first temperature of the battery cell module 250 by the first temperature sensor 270, and detects the first temperature of the battery cell module 250 It can be determined that overheating has occurred when the temperature is equal to or higher than the set temperature. In this case, the second temperature sensor 280 may not be provided.

The contactless power receiving and controlling part 210 detects the first temperature of the battery cell module 250 by the first temperature sensor 270 and the contactless power receiving device 200 by the second temperature sensor 280. [ When the first temperature of the battery cell module 250 is higher than a preset temperature based on the detected second temperature, for example, when the second temperature is higher than the second temperature, 1 may be determined to be overheated when the temperature of the battery cell module 250 is higher than 10 ° C.

If the battery cell module 250 does not overheat, the non-contact power receiving control unit 210 monitors the charging unit 240 to determine whether charging is completed in the battery cell module 250 (S210).

If it is determined that charging has been completed without overheating in the battery cell 250, the non-contact power receiving control unit 210 controls the second signal transfer unit 290 to output a charge completion signal And transmits the generated charge completion signal to the non-contact power transmission device 100 through the power receiving coil 220 (S212).

As described above, the charge completion signal transmitted from the non-contact power receiving apparatus 200 is received by the first signal receiving unit 160 by being guided to the power transmission coil 140 of the non-contact power transmission apparatus 100 The contactless power transmission control unit 110 may receive the signal of the first signal receiving unit 160 and determine whether the charge completion signal is received in the step S118.

If it is determined that the battery cell module 250 is overheated before the charging of the battery cell module 250 is completed, the non-contact power receiving control unit 210 controls the second signal transmitting unit 290, Generates an alarm signal, and the generated overheating alarm signal is transmitted to the contactless power transmission device 100 through the power receiving coil 220 (S214).

The overheat alarm signal transmitted by the contactless power receiving apparatus 200 is guided to the power transmission coil 140 and received by the first signal receiving unit 160. As described above, the contactless power transmission control unit 110 A signal received by the first signal receiving unit 160 is input to determine whether or not an overheating alarm signal is received in step S112 and when the overheat alarm signal is received, And generates a driving signal for a second power transmission lower than the power to control the second power to be transmitted.

In this state, the non-contact power receiving control unit 210 switches the charging unit 240 to the second power charging mode and controls the battery cell module 250 to charge the second power (S216).

That is, when the charging unit 240 receives the second power lower than the first power from the rectifying unit 230 in a state where the charging unit 240 charges the first power to the battery cell module 250, the charging unit 240 generates an error There is a possibility that

Therefore, in the present invention, after the non-contact power receiving control unit 210 generates the overheating alarm signal, the charging unit 240 is switched to the second power charging mode so as not to determine the occurrence of the error.

In the state where the battery cell module 250 is charged with the second power, the non-contact power receiving control unit 210 monitors the charging unit 240 to determine whether charging is completed in the battery cell module 250 (S218).

If it is determined that the charging is not completed, the contactless power receiving control unit 210 repeatedly determines whether or not the charging of the battery cell module 250 is completed.

When it is determined that charging is completed in the battery cell module 250, the contactless power receiving control unit 210 controls the second signal transfer unit 290 to generate a charge completion signal, To the non-contact power transmission apparatus 100 through the power receiving coil 220 (S220), and ends the charging operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: Solid state power transmission device 110: Solid state power transmission control
120: driving driver 130: series resonant converter
140: power transmission coil 150: first signal transmission unit
160: first signal receiving unit 200: non-contact power receiving device
210: a non-contact power receiving control unit 220: a power receiving coil
230: rectification part 240:
250: battery cell module 260: second signal receiving section
270: first temperature sensor 280: second temperature sensor
290: a second signal transmission unit

Claims (1)

A power receiving apparatus for receiving power transmitted from a power transmitting apparatus in a wireless manner,
A power receiving coil for receiving a first power transmitted from the power transmission device;
A rectifier for rectifying the first power received at the power receiving coil;
And controls the power transmission coil to transmit a second signal to the power transmission device when a first signal is received from the power transmission device after generating a change in impedance in the power transmission coil of the power transmission device, The control unit controls to charge the battery cell module using the first power when the power is received, and determines whether the power receiving apparatus is overheated while receiving the first power, and when the overheat of the power receiving apparatus is detected, A controller for controlling the transmission device to transmit an overheat alarm signal and receiving a second power lower than the first power from the power transmission device through the power reception coil;
Lt; / RTI >
Wherein,
And controls to receive the second power in a state that is switched to a mode different from the mode in which the first power is received, when the overheat of the power receiving device is detected.

Images